Commit f641699 (for bug 675333) introduced a check whether the Exec= program in
a .desktop actually exists. This broke the /appinfo/mime/* test cases which use
executable names like "my_app".
Use real ones instead (like "echo" and "sleep"), and add a new
/appinfo/mime/ignore-nonexisting test case which verifies that
g_desktop_app_info_new() indeed ignores nonexisting executables.
https://bugzilla.gnome.org/show_bug.cgi?id=695191
Very many testcases, some GLib tools (resource compiler, etc) and
GApplication were calling g_type_init().
Remove those uses, as they are no longer required.
https://bugzilla.gnome.org/show_bug.cgi?id=686161
This tests the interaction between mimeinfo.cache, defaults.list and
mimeapps.list to ensure g_app_info_set_as_last_used_for_type doesn't
incorrectly change the default.
https://bugzilla.gnome.org/show_bug.cgi?id=658188
